RFR: Merge lworld [v2]

[David Simms]

> Merge branch 'lworld' into species_merge_lworld_17_19
> # Conflicts:
> #	src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassFile.java

David Simms has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Merge branch 'lworld' into species_merge_lworld_17_19
   
   # Conflicts:
   #	src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassFile.java
 - javac support for Parametric VM, first stab
   
   Reviewed-by: mcimadamore
 - Merge lworld
   
   Merge tag 'jdk-17+12'

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Changes: https://git.openjdk.java.net/valhalla/pull/393/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=393&range=01
  Stats: 767 lines in 24 files changed: 759 ins; 2 del; 6 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/393.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/393/head:pull/393

PR: https://git.openjdk.java.net/valhalla/pull/393